- She did say “every day” (or at least published articles have) but as she’s not an anal distance runner she could have meant 4-5 days/week with no duplicitous intent.
- As others have noted, her set may be 3:15 but that includes a bunch of costume changes, special effects and audience interaction, not to mention instrumentation. Not hard to believe that when stripped down to her singing straight through it’s more like 2:00.
- If she’s averaging 12 minute miles for 2 hours, that’s 10 miles. If she does that 4-5 days/week, we’re down to half of the OP’s “90 mpw,” and that’s distance traveled on her feet, not distance run.
- I see random middle aged women with full time jobs do an hour on the elliptical or walking/jogging on the treadmill 5 days a week at the Y. Why would I be skeptical of a 33 year old self-made billionaire with all the time in the world doing 2+ hour sessions to prepare for an ambitious world tour?
- Don’t think for a second that her workout regimen would translate to a good 5k time—only a young runner unable to see beyond their limited scope would think that. To run a 20:40 5k you have to run 9 mph for an extended time, and there’s no reason to believe T-Swift cranked up to that speed even for a second. Excellent fitness for her is more likely being able to jog 9 minute miles for an hour and not be exhausted or sore the next day.